High Voltage Instruments

High Voltage, Inc. designs and manufactures high voltage test equipment for testing utility substation apparatus, aerial lifts, MV & HV power cable, and cable fault locating products. While HVI is the leader in producing portable field test equipment, we also offer a line of higher power AC and DC high voltage test sets for the industrial market. We are a worldwide company with representatives in over 50 countries and half our sales foreign.

One of our greatest design accomplishments was the Very Low Frequency (VLF) technology developed and patented by HVI. HVI produces the top line of VLF AC Hipots, with models ranging from 28kV-200kV and models designed for short run 15kV cable testing to models capable of testing 50 miles of cable. Our new 200kV model now brings filed AC cable testing to 138kV cable and a voltage source for Tan Delta and Partial Discharge testing cables rated up to 230kV. HVI is the VLF Company in this country and around the world, with over 1,500 units already delivered to nearly 80 countries.